Messages in this thread | | | Date | Wed, 15 Mar 2006 17:07:27 -0500 | From | Benjamin LaHaise <> | Subject | Re: [RFC][PATCH] Expanding the size of "start" and "end" field in "struct resource" |
| |
On Wed, Mar 15, 2006 at 02:59:54PM -0700, Eric W. Biederman wrote: > Actually now that I think back there are machines with < 4GiB of ram > with 64bit pci BAR values. It is more common to have 32bit values BAR > values and > 4GiB of ram.
Such machines on x86 would have to be compiled with PAE. Ditto any other architecture, as you *have* to be able to represent those physical addresses, which requires having page tables that can map them, which requires whatever PAE is on the platform.
> Nor do I think struct resource is nearly as important when being > efficient, as dma_addr_t. struct resource is only used during > driver setup which is a very rare event. A few extra instructions > there likely will get lost in the noise and most of the will probably > be removed because they are in an __init section anyway.
Bloat for no good reason is a bad habit to get into.
-ben -- "Time is of no importance, Mr. President, only life is important." Don't Email: <dont@kvack.org>. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |